The existing isWifiTetheringSupported only check if tethering side
supports wifi tethering or not but not wifi side. A expected
behavior should include both of them, so add the wifi side check
into the helper function. Also update in the existing caller side
due to a new parameter added.
Bug: 186061922
Test: atest MtsTetheringTestLatestSdk
Megred-In: Id69ac1d30ab2bbf23e870193335b139f54672636
Change-Id: Id69ac1d30ab2bbf23e870193335b139f54672636
Ignore-AOSP-First: cherry-pick
0acaa74538